diff -ruN linux-2.6.9/fs/xfs/xfs_clnt.h linux-2.6.9-pkeep/fs/xfs/xfs_clnt.h
--- linux-2.6.9/fs/xfs/xfs_clnt.h	2004-10-18 23:54:38.000000000 +0200
+++ linux-2.6.9-pkeep/fs/xfs/xfs_clnt.h	2004-11-26 14:07:52.000000000 +0100
@@ -102,5 +102,7 @@
 #define XFSMNT_IDELETE		0x08000000	/* inode cluster delete */
 #define XFSMNT_SWALLOC		0x10000000	/* turn on stripe width
 						 * allocation */
+#define XFSMNT_PKEEP		0x20000000	/* keep preallocated blocks
+						   after close() */
 
 #endif	/* __XFS_CLNT_H__ */
diff -ruN linux-2.6.9/fs/xfs/xfs_mount.h linux-2.6.9-pkeep/fs/xfs/xfs_mount.h
--- linux-2.6.9/fs/xfs/xfs_mount.h	2004-10-18 23:53:05.000000000 +0200
+++ linux-2.6.9-pkeep/fs/xfs/xfs_mount.h	2004-11-26 14:13:47.000000000 +0100
@@ -418,6 +418,8 @@
 #define XFS_MOUNT_IDELETE	0x00040000	/* delete empty inode clusters*/
 #define XFS_MOUNT_SWALLOC	0x00080000	/* turn on stripe width
 						 * allocation */
+#define XFS_MOUNT_PKEEP		0x00080000	/* keep preallocated blocks
+						 * after close() */
 
 /*
  * Default minimum read and write sizes.
@@ -429,7 +431,7 @@
  * Max and min values for UIO and mount-option defined I/O sizes;
  * min value can't be less than a page.  Currently unused.
  */
-#define XFS_MAX_IO_LOG		16	/* 64K */
+#define XFS_MAX_IO_LOG		26	/* 64M */
 #define XFS_MIN_IO_LOG		PAGE_SHIFT
 
 /*
diff -ruN linux-2.6.9/fs/xfs/xfs_vfsops.c linux-2.6.9-pkeep/fs/xfs/xfs_vfsops.c
--- linux-2.6.9/fs/xfs/xfs_vfsops.c	2004-10-18 23:53:43.000000000 +0200
+++ linux-2.6.9-pkeep/fs/xfs/xfs_vfsops.c	2004-11-26 14:10:13.000000000 +0100
@@ -320,6 +320,8 @@
 		mp->m_flags |= XFS_MOUNT_NOUUID;
 	if (ap->flags & XFSMNT_NOLOGFLUSH)
 		mp->m_flags |= XFS_MOUNT_NOLOGFLUSH;
+	if (ap->flags & XFSMNT_PKEEP)
+		mp->m_flags |= XFS_MOUNT_PKEEP;
 
 	return 0;
 }
@@ -1652,6 +1654,7 @@
 #define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */
 #define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
 #define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */
+#define MNTOPT_PKEEP	"pkeep"		/* do not free preallocs on close */
 
 
 int
@@ -1776,6 +1779,8 @@
 			args->flags |= XFSMNT_NOUUID;
 		} else if (!strcmp(this_char, MNTOPT_NOLOGFLUSH)) {
 			args->flags |= XFSMNT_NOLOGFLUSH;
+		} else if (!strcmp(this_char, MNTOPT_PKEEP)) {
+			args->flags |= XFSMNT_PKEEP;
 		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
 			args->flags &= ~XFSMNT_IDELETE;
 		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
@@ -1851,6 +1856,7 @@
 		{ XFS_MOUNT_OSYNCISOSYNC,	"," MNTOPT_OSYNCISOSYNC },
 		{ XFS_MOUNT_NOLOGFLUSH,		"," MNTOPT_NOLOGFLUSH },
 		{ XFS_MOUNT_IDELETE,		"," MNTOPT_NOIKEEP },
+		{ XFS_MOUNT_PKEEP,		"," MNTOPT_PKEEP },
 		{ 0, NULL }
 	};
 	struct proc_xfs_info	*xfs_infop;
diff -ruN linux-2.6.9/fs/xfs/xfs_vnodeops.c linux-2.6.9-pkeep/fs/xfs/xfs_vnodeops.c
--- linux-2.6.9/fs/xfs/xfs_vnodeops.c	2004-10-18 23:55:36.000000000 +0200
+++ linux-2.6.9-pkeep/fs/xfs/xfs_vnodeops.c	2004-11-26 14:12:53.000000000 +0100
@@ -1214,6 +1214,13 @@
 	xfs_bmbt_irec_t	imap;
 
 	/*
+	 * If mounted with the "pkeep" option, do not remove any
+	 * preallocated blocks at the end of the file at close().
+	 */
+	if (mp->m_flags & XFS_MOUNT_PKEEP)
+		return (0);
+
+	/*
 	 * Figure out if there are any blocks beyond the end
 	 * of the file.  If not, then there is nothing to do.
 	 */